Abstract
Attempts have been made to synthesize alumina doped calcium silicate glasses in the system 40SiO2–35K2O-(25-x)CaO (x = 0, 2, 4, and 6) via melt-quenching method. Density of the glasses were estimated by employing Archimedes’ principle and obtained within the range of 2.421±0.012 to 2.176±0.011 gm/cm3, the oxygen packing density (OPD) and ionic concentrations were estimated and found to be in the range of 58.818±0.294–54.161±0.271 × 10−3 gm-atom/cm3 and 0–195.725±0.979 ion/cm3 respectively. FTIR and Raman investigations showed the existence of numerous bonds of Si-O-Si, β-CaSiO3, Si-O−, C = O, CO32− and OH, which are due to diverse modes of vibrations. As doping concentration of Al2O3 increases optical band-gap increase from 1.5 to 2.5 eV. Refractive index (n), and optical dielectric constant (ε) were determined and lies within the range of 1.210±0.024–0.827±0.017 and 1.464±0.029- 0.684±0.014. CO2 gas sensing measurements were done at room temperature, 32 °C and maximum sensor response (9.93) was recorded for the glass SKCA6 at 1000 ppm.
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